I bought mine from anycake.com and it is brilliant. I also buy all the edible ink from there and icing sheets from there, or I get rice paper printing sheets from ebay.
I used to buy the cartridges and replace each time but I have recently bought the ink refils but am yet to try them.
They are quick on delivery and also for over the phone help if you can’t work something out.
It comes with a free software with templates for cupcakes toppers etc.
Hope this helps!